BUSINESS AND ORGANIZATION - Narrative (Details) $ / shares in Units, ft² in Millions							1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Jan. 18, 2022 shares	Jan. 05, 2022	Dec. 31, 2021 acquisition property disposition ft² $ / shares shares	Sep. 14, 2021 $ / shares shares	Feb. 01, 2021 $ / shares	Aug. 11, 2017 shares	Feb. 28, 2022 disposition	Jan. 31, 2022 property acquisition $ / shares	Mar. 31, 2021 lease	Sep. 30, 2020 lease	Dec. 31, 2021 property ft² $ / shares shares	Dec. 31, 2020 property $ / shares shares	Feb. 01, 2022 $ / shares	Sep. 30, 2021 property shares	Aug. 04, 2021 $ / shares	Jun. 29, 2021 USD ($)	May 05, 2021 $ / shares	Jan. 31, 2021 $ / shares	Jan. 27, 2021 USD ($) $ / shares	Jan. 22, 2021 USD ($)	May 20, 2020 $ / shares	Dec. 31, 2019 $ / shares	Dec. 23, 2019 USD ($)	Jul. 20, 2016 USD ($)	Jul. 15, 2015 USD ($)
Business And Organization [Line Items]
Issued common stock (in shares) | shares			450,000,000								450,000,000
Preferred stock, shares authorized (in shares) | shares			50,000,000								50,000,000			50,000,000
Preferred stock par value (in usd per share) | $ / shares			$ 0.001								$ 0.001
Rentable Square Feet | ft²			2.4								2.4
Number of real estate properties			38								38			32
Number of properties classified as real estate held for sale											4	2
Number of real estate properties sold									3	5	5
Net asset value (in usd per share) | $ / shares															$ 26.05		$ 24.61	$ 30.81	$ 23.03		$ 21.01
Reverse stock split, conversion ratio					0.3333
Pro Forma
Business And Organization [Line Items]
Number of real estate properties			36								36
Number of acquisitions | acquisition			2
Number of dispositions | disposition			4
Subsequent Event
Business And Organization [Line Items]
Number of real estate properties								32
Number of acquisitions | acquisition								2
Number of dispositions | disposition							4
Net asset value (in usd per share) | $ / shares								$ 28.74					$ 27.29
Reverse stock split, conversion ratio		0.1
Tenant-in-common | Real Estate Investment
Business And Organization [Line Items]
Investment allocation, percent			72.70%								72.70%
DRP
Business And Organization [Line Items]
Net asset value (in usd per share) | $ / shares																						$ 30.48
IPO
Business And Organization [Line Items]
Common stock subscriptions | $																									$ 30,000,000
Registered Offering
Business And Organization [Line Items]
Common stock subscriptions | $																									$ 3,333,333
Retail
Business And Organization [Line Items]
Number of real estate properties			12								12
Number of properties classified as real estate held for sale											4	4
Number of real estate properties sold											3
Retail | Pro Forma
Business And Organization [Line Items]
Number of real estate properties			13								13
Retail | Real Estate Investment | Pro Forma
Business And Organization [Line Items]
Investment allocation, percent			21.00%								21.00%
Industrial
Business And Organization [Line Items]
Number of real estate properties			12								12
Number of real estate properties sold											1
Industrial | Pro Forma
Business And Organization [Line Items]
Number of real estate properties			12								12
Office
Business And Organization [Line Items]
Number of real estate properties			14								14
Office | Pro Forma
Business And Organization [Line Items]
Number of real estate properties			11								11
Office | Real Estate Investment | Pro Forma
Business And Organization [Line Items]
Investment allocation, percent			39.00%								39.00%
Industrial Property Including Tenant-In-Common Interest | Real Estate Investment | Pro Forma
Business And Organization [Line Items]
Investment allocation, percent			40.00%								40.00%
Operating Partnership
Business And Organization [Line Items]
Ownership interest (as a percent)											86.00%	87.00%
Operating Partnership | Subsequent Event
Business And Organization [Line Items]
Ownership interest (as a percent)								73.00%
Class S
Business And Organization [Line Items]
Common stock, shares authorized (in shares) | shares			100,000,000								100,000,000	100,000,000
Common stock par value (in usd per share) | $ / shares			$ 0.001		$ 0.001						$ 0.001	$ 0.001						0.003
Issuance of stock (in shares) | shares						33,333,333
Class S | Subsequent Event
Business And Organization [Line Items]
Common stock par value (in usd per share) | $ / shares													0.0001
Class C
Business And Organization [Line Items]
Common stock, shares authorized (in shares) | shares			300,000,000								300,000,000	300,000,000
Common stock par value (in usd per share) | $ / shares			$ 0.001		$ 0.001						$ 0.001	$ 0.001						$ 0.003
Common stock subscriptions | $																							$ 800,000,000
Minimum share value | $																								$ 500
Reverse stock split, conversion ratio											1
Class C | Subsequent Event
Business And Organization [Line Items]
Common stock par value (in usd per share) | $ / shares													$ 0.0001
Class C | Subsequent Event | KIA Dealership Carson, California | KIA Dealership
Business And Organization [Line Items]
Consideration transferred (in shares) | shares	1,312,382
Class C | DRP
Business And Organization [Line Items]
Common stock subscriptions | $																$ 75,000,000							75,000,000
Class C | Follow-on Offering
Business And Organization [Line Items]
Common stock subscriptions | $																			$ 600,547,672				$ 725,000,000
Class C | 2021 DRP Offering
Business And Organization [Line Items]
Common stock subscriptions | $																				$ 100,000,000
Series A Preferred Stock
Business And Organization [Line Items]
Preferred stock, shares authorized (in shares) | shares														2,000,000
Preferred stock par value (in usd per share) | $ / shares				$ 0.001
Preferred stock, dividend rate, percentage											7.375%
Sale of stock, price per share | $ / shares				$ 25.00
Series A Preferred Stock | IPO
Business And Organization [Line Items]
Common stock issued in transaction (in shares) | shares				1,800,000
Series A Preferred Stock | Over-Allotment Option
Business And Organization [Line Items]
Common stock issued in transaction (in shares) | shares				200,000